Where does the speedometer cable connect to a 1974 Mercedes 450sl?

In a 1974 Mercedes 450SL, the speedometer cable connects to the back of the speedometer gauge located on the instrument cluster. The other end of the cable attaches to the transmission, specifically to the speedometer drive on the transmission casing. This cable transmits the rotational speed from the transmission to the speedometer, allowing it to display the vehicle's speed.